Question

我正在尝试查找客户和客户从各种不同表格中共同拥有的所有IP数量。我知道在子查询中，最内层的查询无法访问最外层的查询，但我不确定如何连接表来解决这个问题。

非常感谢任何帮助。

表格订单是评论，company_user_role，previous_state_transitions

SELECT 
r.id, r.state,

(SELECT count(dog.ip_address)

FROM

(SELECT DISTINCT ip_address COLLATE utf8_unicode_ci AS ip_address
FROM previous_state_transitions
WHERE user_id = r.user_id

UNION

SELECT DISTINCT ip_address COLLATE utf8_unicode_ci AS ip_address
FROM previous_state_transitions
WHERE state_machineable_id = r.user_id
AND state_machineable_type = "User"

UNION 

SELECT DISTINCT ip_address
FROM reviews 
WHERE user_id = r.user_id) AS dog

INNER JOIN

(SELECT DISTINCT ip_address COLLATE utf8_unicode_ci AS ip_address
FROM previous_state_transitions
WHERE user_id IN (SELECT user_id FROM company_user_roles WHERE company_id = r.company_id)

UNION

SELECT DISTINCT ip_address COLLATE utf8_unicode_ci AS ip_address
FROM previous_state_transitions
WHERE state_machineable_id = (SELECT user_id FROM company_user_roles WHERE company_id = r.company_id)
AND state_machineable_type = "User"

UNION 

SELECT DISTINCT ip_address
FROM reviews 
WHERE user_id = (SELECT user_id FROM company_user_roles WHERE company_id = r.company_id)) AS cat

ON dog.ip_address = cat.ip_address) AS ip_count_in_common

FROM reviews AS r
WHERE r.created_at > '2016-10-13'
ORDER BY 1 desc

Answer 1

您的基本问题是在定义之前使用结果r中的数据。

换句话说：您无法在构成r的定义中引用最终结果r。

您应该做的是从每个子查询开始，看看代码是否依赖于它。当它没有 - 如同引用r的任何情况 - 你需要考虑一个不同的解决方案，例如在输出中返回user_id。

很抱歉，我只能给你一个解决问题的方法，而不是解决方案本身。和蒂姆一样，我试图为你编辑查询，但它太长了，我需要知道整个数据结构才能知道最佳解决方案。

在WHERE子句中找不到列r.user_id

1 个答案: